package cn.tedu._05weibo.base.interceptor;

import cn.tedu._05weibo.pojo.vo.UserVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

@Slf4j
public class LoginCheckInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        log.debug("拦截器进行登录状态校验...");
        /*1.获取session会话对象--
        HttpSession session = request.getSession()
        * 2.通过会话对象获取用户标识[getAttribute]
        * 3.判断用户标识是否为null
        *   3.1若不为null则放行return ture
        *   3.2若为null未登录
        *       重定向登录页面--response.sendRedirect("/login.html)
        *       return false*/
        HttpSession session = request.getSession();
        UserVO userVO = (UserVO) session.getAttribute("user");
        if (userVO!=null){
            return true;
        }
        response.sendRedirect("/login.html");
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
